service manual is availa at tractor supply and online.
newsflash!
yer fergy t0-30 has non live hyds via a belly pump.. the pto runs that belly pump.. thus pto has to be running to have hyds.
also.. you have draft control hyds ONLY.. no position control. due to this your lift will seemingly act like it has only all the way up or all he way down/. takes a light hand to find the middle. if you are completely unable to find a middle.. the lift cover needs a lil adjustment. most people with fergy's and 9n/2n fords invest in some depth limit chains and put them on brush hogs and just lift for transport then drop onto the chains for mowing..